Improved sawing-machine



j sawing-machine of simple construction, which gears, all being arrangedin such a manner UNITED STATES y PATENT OFFICE.Y

JOHN L. KNOWLTON, OF BOBDENTOWN, NEW JERSEY.

IMPROVED sAw|NGMAcH|NE- Specification forming part of Letters Patent No.40,344, dated October 20, 1863.

.To all whom it may concern.-

Be it known that I, J oHN L. KNowL'roN, of Bordentown, in the county ofBuitreigw/nandf State of New Jersey, have inven l a new and improvedmachine for sawing timber in curved and bevel form-such as ship-timber;and I do hereby declare that the followin g is a full, clear, and exactdescription of the same, reference being had to the accompanyingdrawings, making a part of this specilication, in which- Figure l is afront sectional view of my invention, taken in the line x w, Fig. 2;Fig. 2, a side sectional view of my invention, taken in the line y y,Fig. 1.

Similar letters of reference indicate corresponding parts in the twofigures.

The object of this invention is to obtain a may be adjusted ormanipulated with the greatest facility for sawing ship and other timberin curved and beveled form.

The invention consists in placing the gate or sash of a reciprocatingsaw between guides which are attached to a graduated ring fitted betweenfrictionrollers and provided with a concentric sector-rack, into which apinion that the saw, while in operation, may be adjusted from a verticalto a more or less inclined position at either side of a verticalposition, according to the bevel required.

The invention further consists in a novel manner of driving or operatingthe saw, whereby the latter may be operated or driven with equalfacility at any angle or position in which it may be placed.

To enable those skilled in the art to fully understand and construct myinvention, I will proceed to describe it.

A represents a framing, which supports a horizontal bed, B 5 and a a aretwo uprights, one being at each side of the framing, and connected attheir upper ends by a crossbar, I).

G represents a ring, which may be of wood or metalcast-iron would be thepreferable tween friction-rollers D, which are attached glo/the uprightsa a, two to each upright, the

ange c fitting in grooves in the peripheries of the rollers D. 'Ihefront or face side of C there is a sector-rack, E, into which apinion,F, gears, said pinion being on a shaft," d, which has a hand-wheel, G,on its back end, and its bearings e attached to one of the uprights a.

To the ring G there are attached two parallel guides, ff, said guidesbeing at opposite sides of the ring, and between these guides a sawframe or sash, H, is fitted and allowed to work freely.

I is the saw, which is secured in the frame or sash in the usual or anyproper way, said saw moving through a hole, g, in the bed B.

The lower cross-bar, h, of the frame or sash H, is attached to a bar orslide, z', which is fitted between pendent guides j j, attached to thelower part of the ring O, and the slide t' is connected at its lower endby a pitman, J, with a crank-pulley, K, on the inner end of adrivingshaft, L, which is in a plane that passes through the center ofthe ring C.

The operation is as follows: The shaft L is rotated by any convenientpower, and a reciprocating motion is communicated to the saw frame orsash H from the shaft L by means of the crank-pulley K, pitman J, andslidebar z'. The stuff or timber to be sawed is placed upon the bed B,and fed to the saw by hand or by any other suitable feed mechanism, andthe saw I, while in operation, is adjusted in an inclined position,either to the right or left, to suit the bevel required to be given thetimber, and as this bevel in shiptimber is continually varying, the sawI is moved or adjusted accordingly by simplyT turning the hand-wheel G,the pinion F on shaft d, and sector-rack E on ring O, causing the latterto turn, and with it the saw I. The graduated front of the ring O servesas a guide to the adjustment of the saw, while the timber is marked atdifferent points, indicatmaterial. Ilhis ring G is provided at itsperiphery with a flange, c, and fitted being the bevel that is to begiven it.

Having thus described my invention, what the ring C is graduated intodegrees, aas shown in Fig. l, and at the back of thc'ring I claim asnew, and desire to secure by Letters 2. Operating the saw frame or sashH Patent, isthrough the medium ofthe slide z', pitman J,

l. The attaching.;` of the saw frame or sash and crank-pulley K, allarranged substantially H t0 a ring, C, fitted Within friction-rollers asdescribed.

D, and turned or adjusted by means of the JOHN L. KNOVVLTON.

seotorraok E and pinions F, or their equiva- Witnesses:

lents, substantially as and for the purpose set GEORGE W. PITMAN,

forth. JOHN B. HULsE.

